[PATCH 1/4] drm/i915: Use GEN12_RPSTAT register for GT freq
Ashutosh Dixit
ashutosh.dixit at intel.com
Wed Oct 19 05:20:40 UTC 2022
From: Don Hiatt <don.hiatt at intel.com>
On GEN12+ use GEN12_RPSTAT register to get actual resolved GT
freq. GEN12_RPSTAT does not require a forcewake and will return 0 freq if
GT is in RC6.
v2:
- Fixed review comments(Ashutosh)
- Added function intel_rps_read_rpstat_fw to read RPSTAT without
forcewake, required especially for GEN6_RPSTAT1 (Ashutosh, Tvrtko)
v3:
- Updated commit title and message for more clarity (Ashutosh)
- Replaced intel_rps_read_rpstat with direct read to GEN12_RPSTAT1 in
read_cagf (Ashutosh)
Cc: Don Hiatt <donhiatt at gmail.com>
Cc: Andi Shyti <andi.shyti at intel.com>
Signed-off-by: Don Hiatt <don.hiatt at intel.com>
Signed-off-by: Badal Nilawar <badal.nilawar at intel.com>
Signed-off-by: Ashutosh Dixit <ashutosh.dixit at intel.com>
Reviewed-by: Andi Shyti <andi.shyti at linux.intel.com>
---
drivers/gpu/drm/i915/gt/intel_gt_regs.h | 2 ++
drivers/gpu/drm/i915/gt/intel_rps.c | 32 +++++++++++++++++++++----
drivers/gpu/drm/i915/gt/intel_rps.h | 2 ++
drivers/gpu/drm/i915/i915_pmu.c | 3 +--
4 files changed, 33 insertions(+), 6 deletions(-)
diff --git a/drivers/gpu/drm/i915/gt/intel_gt_regs.h b/drivers/gpu/drm/i915/gt/intel_gt_regs.h
index 36d95b79022c0..a7a0129d0e3fc 100644
--- a/drivers/gpu/drm/i915/gt/intel_gt_regs.h
+++ b/drivers/gpu/drm/i915/gt/intel_gt_regs.h
@@ -1543,6 +1543,8 @@
#define GEN12_RPSTAT1 _MMIO(0x1381b4)
#define GEN12_VOLTAGE_MASK REG_GENMASK(10, 0)
+#define GEN12_CAGF_SHIFT 11
+#define GEN12_CAGF_MASK REG_GENMASK(19, 11)
#define GEN11_GT_INTR_DW(x) _MMIO(0x190018 + ((x) * 4))
#define GEN11_CSME (31)
diff --git a/drivers/gpu/drm/i915/gt/intel_rps.c b/drivers/gpu/drm/i915/gt/intel_rps.c
index fc23c562d9b2a..df21258976d86 100644
--- a/drivers/gpu/drm/i915/gt/intel_rps.c
+++ b/drivers/gpu/drm/i915/gt/intel_rps.c
@@ -2068,12 +2068,34 @@ void intel_rps_sanitize(struct intel_rps *rps)
rps_disable_interrupts(rps);
}
+u32 intel_rps_read_rpstat_fw(struct intel_rps *rps)
+{
+ struct drm_i915_private *i915 = rps_to_i915(rps);
+ i915_reg_t rpstat;
+
+ rpstat = (GRAPHICS_VER(i915) >= 12) ? GEN12_RPSTAT1 : GEN6_RPSTAT1;
+
+ return intel_uncore_read_fw(rps_to_gt(rps)->uncore, rpstat);
+}
+
+u32 intel_rps_read_rpstat(struct intel_rps *rps)
+{
+ struct drm_i915_private *i915 = rps_to_i915(rps);
+ i915_reg_t rpstat;
+
+ rpstat = (GRAPHICS_VER(i915) >= 12) ? GEN12_RPSTAT1 : GEN6_RPSTAT1;
+
+ return intel_uncore_read(rps_to_gt(rps)->uncore, rpstat);
+}
+
u32 intel_rps_get_cagf(struct intel_rps *rps, u32 rpstat)
{
struct drm_i915_private *i915 = rps_to_i915(rps);
u32 cagf;
- if (IS_VALLEYVIEW(i915) || IS_CHERRYVIEW(i915))
+ if (GRAPHICS_VER(i915) >= 12)
+ cagf = (rpstat & GEN12_CAGF_MASK) >> GEN12_CAGF_SHIFT;
+ else if (IS_VALLEYVIEW(i915) || IS_CHERRYVIEW(i915))
cagf = (rpstat >> 8) & 0xff;
else if (GRAPHICS_VER(i915) >= 9)
cagf = (rpstat & GEN9_CAGF_MASK) >> GEN9_CAGF_SHIFT;
@@ -2094,7 +2116,9 @@ static u32 read_cagf(struct intel_rps *rps)
struct intel_uncore *uncore = rps_to_uncore(rps);
u32 freq;
- if (IS_VALLEYVIEW(i915) || IS_CHERRYVIEW(i915)) {
+ if (GRAPHICS_VER(i915) >= 12) {
+ freq = intel_uncore_read(uncore, GEN12_RPSTAT1);
+ } else if (IS_VALLEYVIEW(i915) || IS_CHERRYVIEW(i915)) {
vlv_punit_get(i915);
freq = vlv_punit_read(i915, PUNIT_REG_GPU_FREQ_STS);
vlv_punit_put(i915);
@@ -2260,7 +2284,7 @@ static void rps_frequency_dump(struct intel_rps *rps, struct drm_printer *p)
rpinclimit = intel_uncore_read(uncore, GEN6_RP_UP_THRESHOLD);
rpdeclimit = intel_uncore_read(uncore, GEN6_RP_DOWN_THRESHOLD);
- rpstat = intel_uncore_read(uncore, GEN6_RPSTAT1);
+ rpstat = intel_rps_read_rpstat(rps);
rpcurupei = intel_uncore_read(uncore, GEN6_RP_CUR_UP_EI) & GEN6_CURICONT_MASK;
rpcurup = intel_uncore_read(uncore, GEN6_RP_CUR_UP) & GEN6_CURBSYTAVG_MASK;
rpprevup = intel_uncore_read(uncore, GEN6_RP_PREV_UP) & GEN6_CURBSYTAVG_MASK;
@@ -2395,7 +2419,7 @@ static void slpc_frequency_dump(struct intel_rps *rps, struct drm_printer *p)
drm_printf(p, "PM MASK=0x%08x\n", pm_mask);
drm_printf(p, "pm_intrmsk_mbz: 0x%08x\n",
rps->pm_intrmsk_mbz);
- drm_printf(p, "RPSTAT1: 0x%08x\n", intel_uncore_read(uncore, GEN6_RPSTAT1));
+ drm_printf(p, "RPSTAT1: 0x%08x\n", intel_rps_read_rpstat(rps));
drm_printf(p, "RPNSWREQ: %dMHz\n", intel_rps_get_requested_frequency(rps));
drm_printf(p, "Lowest (RPN) frequency: %dMHz\n",
intel_gpu_freq(rps, caps.min_freq));
diff --git a/drivers/gpu/drm/i915/gt/intel_rps.h b/drivers/gpu/drm/i915/gt/intel_rps.h
index 110300dfd4383..9e1cad9ba0e9c 100644
--- a/drivers/gpu/drm/i915/gt/intel_rps.h
+++ b/drivers/gpu/drm/i915/gt/intel_rps.h
@@ -48,6 +48,8 @@ u32 intel_rps_get_rp1_frequency(struct intel_rps *rps);
u32 intel_rps_get_rpn_frequency(struct intel_rps *rps);
u32 intel_rps_read_punit_req(struct intel_rps *rps);
u32 intel_rps_read_punit_req_frequency(struct intel_rps *rps);
+u32 intel_rps_read_rpstat(struct intel_rps *rps);
+u32 intel_rps_read_rpstat_fw(struct intel_rps *rps);
void gen6_rps_get_freq_caps(struct intel_rps *rps, struct intel_rps_freq_caps *caps);
void intel_rps_raise_unslice(struct intel_rps *rps);
void intel_rps_lower_unslice(struct intel_rps *rps);
diff --git a/drivers/gpu/drm/i915/i915_pmu.c b/drivers/gpu/drm/i915/i915_pmu.c
index 958b37123bf12..67140a87182f8 100644
--- a/drivers/gpu/drm/i915/i915_pmu.c
+++ b/drivers/gpu/drm/i915/i915_pmu.c
@@ -371,7 +371,6 @@ static void
frequency_sample(struct intel_gt *gt, unsigned int period_ns)
{
struct drm_i915_private *i915 = gt->i915;
- struct intel_uncore *uncore = gt->uncore;
struct i915_pmu *pmu = &i915->pmu;
struct intel_rps *rps = >->rps;
@@ -394,7 +393,7 @@ frequency_sample(struct intel_gt *gt, unsigned int period_ns)
* case we assume the system is running at the intended
* frequency. Fortunately, the read should rarely fail!
*/
- val = intel_uncore_read_fw(uncore, GEN6_RPSTAT1);
+ val = intel_rps_read_rpstat_fw(rps);
if (val)
val = intel_rps_get_cagf(rps, val);
else
--
2.38.0
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